edition of Gray's Anatomy of the Human Body, published in 1918 – from ). This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. A broad aponeurotic layer is given off from the tendon of the Digastricus on either side, to be attached to the body and greater cornu of the hyoid bone this is termed the suprahyoid aponeurosis. The two bellies end in an intermediate tendon which perforates the Stylohyoideus muscle, and is held in connection with the side of the body and the greater cornu of the hyoid bone by a fibrous loop, which is sometimes lined by a mucous sheath. The anterior belly arises from a depression on the inner side of the lower border of the mandible, close to the symphysis, and passes downward and backward. METHODS: A total of 41 bilateral neck dissections were performed whereby morphologic observations and morphometric measurements were carried out to characterize and classify the various presentations of the muscle. The posterior belly, longer than the anterior, arises from the mastoid notch of the temporal bone and passes downward and forward. BACKGROUND: This study aims to elucidate anatomical variations of the digastric muscle in the Kenyan population.
It lies below the body of the mandible, and extends, in a curved form, from the mastoid process to the symphysis menti. The Digastricus ( Digastric muscle) consists of two fleshy bellies united by an intermediate rounded tendon. Mylohyoid The mylohyoid is a broad, triangular shaped muscle.
The posterior belly is innervated by the digastric branch of the facial nerve. Nerve: Anterior belly - mandibular division of the trigeminal(CN V) via the mylohyoid nerve posterior belly -facial nerve (CN VII)Īction: Opens the jaw when the masseter and the temporalis are relaxed. Innervation : The anterior belly is innervated by the inferior alveolar nerve, a branch of the mandibular nerve (which is derived from the trigeminal nerve, CN V ). Insertion: Intermediate tendon (hyoid bone) Origin: Anterior belly - digastric fossa (mandible) posterior belly - mastoid process of temporal bone
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